LudyMeter - Sound Level Meter

The only sound meter with EU and UK Noise at Work Regulations tracking. LEX,8h, dose %, musical note detection. One-time purchase. No subscription. Fully offline. iOS 26.

LudyMeter is a professional sound level meter that does two things no other app can: track noise exposure under EU and UK Noise at Work Regulations and detect musical notes from frequency peaks.

No subscription. No ads. Your data never leaves your device.

--- FREE TIER ---

A proper decibel meter, not a crippled demo. Real-time A-weighted measurement with min, max, and average (Leq). Contextual noise comparisons tell you what your reading means in plain English. Seven days of measurement history and shareable sound level cards. Works entirely offline.

--- PRO (GBP 12.99 one-time) ---

Full frequency analysis: real-time FFT spectrum, 1/1 and 1/3 octave bands, and musical note detection that maps frequencies to note names with cent deviation. A/B measurement comparison for evaluating acoustic treatment. Spectrogram waterfall display. EQ recommendations. Unlimited history and CSV export. A, C, Z weighting. Fast, Slow, and Impulse time constants.

--- SAFETY (GBP 44.99 one-time) ---

First and only iOS app with EU Directive 2003/10/EC and UK Control of Noise at Work Regulations 2005 screening support. Calculate LEX,8h, track LCpeak, and monitor dose percentage with a three-zone warning system at 80, 85, and 87 dB(A) action values. Haptic threshold alerts. Full-shift background monitoring. PDF screening reports for workplace documentation. NIOSH and OSHA dosimeter modes included.

LudyMeter is a screening and awareness tool, not a certified Class 1 or Class 2 instrument. It does not replace calibrated equipment required for legally binding workplace noise assessments.

--- PRIVACY ---

Zero data collection. Zero analytics. Zero network calls. Audio is processed on-device and never recorded or transmitted. Works in aeroplane mode. App Store privacy label: Data Not Collected.

--- iOS 26 NATIVE ---

Built from scratch with Liquid Glass design, Dynamic Island, Live Activity on the lock screen, and home screen widgets. Dark mode. 60fps real-time animations.

--- CALIBRATION ---

Three-tier system: automatic per-device profiles, user single-point calibration, and external measurement microphone support. Transparent accuracy disclosure.

--- ONE-TIME PURCHASE ---

No monthly subscription. Pay once, use forever. Free updates.

--- TECHNICAL ---

• Weighting: A, C, Z
• Time constants: Fast (125ms), Slow (1s), Impulse
• FFT: 4096-point Hann, 50% overlap
• Octave bands: 1/1 and 1/3
• Pitch: YIN algorithm, +/-0.5 cent
• EU thresholds: 80/85/87 dB(A), 135/137/140 dB(C) peak
• Audio: AVAudioEngine .measurement mode
• iOS 17+ required, designed for iOS 26

Contact: ludy@ludy.app